Probably for as long as it takes is the answer. In my own experience I would suggest giving it at least a few months. I agree that an hour a day is a lot of time to investe, especially if you feel you may not get any return from using Holosync. You say you do not want to do Holosync for an hour a day "just to achieve nothing". Can I ask what it is you want Holosync to achieve for you?

Regards
Stevie